+/** @param job Optional job for which to report progress */
+string
+md5_digest_directory (boost::filesystem::path directory, shared_ptr<Job> job)
+{
+ int const buffer_size = 64 * 1024;
+ char buffer[buffer_size];
+
+ MD5_CTX md5_context;
+ MD5_Init (&md5_context);
+
+ int files = 0;
+ if (job) {
+ for (boost::filesystem::directory_iterator i(directory); i != boost::filesystem::directory_iterator(); ++i) {
+ ++files;
+ }
+ }
+
+ int j = 0;
+ for (boost::filesystem::directory_iterator i(directory); i != boost::filesystem::directory_iterator(); ++i) {
+ ifstream f (i->path().string().c_str(), std::ios::binary);
+ if (!f.good ()) {
+ throw OpenFileError (i->path().string());
+ }
+
+ f.seekg (0, std::ios::end);
+ int bytes = f.tellg ();
+ f.seekg (0, std::ios::beg);
+
+ while (bytes > 0) {
+ int const t = min (bytes, buffer_size);
+ f.read (buffer, t);
+ MD5_Update (&md5_context, buffer, t);
+ bytes -= t;
+ }
+
+ if (job) {
+ job->set_progress (float (j) / files);
+ ++j;
+ }
+ }
+
+ unsigned char digest[MD5_DIGEST_LENGTH];
+ MD5_Final (digest, &md5_context);
+
+ stringstream s;
+ for (int i = 0; i < MD5_DIGEST_LENGTH; ++i) {
+ s << std::hex << std::setfill('0') << std::setw(2) << ((int) digest[i]);
+ }
+
+ return s.str ();
+}
+